Magnetic Circular Dichroism from the Impurity Band in III-V Diluted Magnetic Semiconductors

被引：22

作者：

Tang, Jian-Ming ^{[1
]}

Flatte, Michael E. ^{[2
]}

机构：

[1] Univ New Hampshire, Dept Phys, Durham, NH 03824 USA

[2] Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 101卷 / 15期

关键词：

D O I：

10.1103/PhysRevLett.101.157203

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The magnetic circular dichroism of III-V diluted magnetic semiconductors, calculated within a theoretical framework suitable for highly disordered materials, is shown to be dominated by optical transitions between the bulk bands and an impurity band formed from magnetic dopant states. The real-space Green's functions incorporate spatial correlations in the disordered conduction band and valence-band electronic structure, and include extended and localized states on an equal basis. Our findings reconcile unusual trends in the experimental magnetic circular dichroism in III-V diluted magnetic semiconductors with the antiferromagnetic p-d exchange interaction between a magnetic dopant spin and its host.

引用

页数：4

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